Steam boiler



April 2, 1929. w, 's; M'oNhO STEAM BOILER INVENTOR."

v4.4 ATTORNEYSQ' Patented Apr. 2, 1929.

UNITED STATES,

PATENT OFFICE.

WILLIAM S. MONROE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE BABCOQK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW-JERSEY.

. STEAM BOILER.

Application filed August 16, 1923. Serial No. 657,672.

In certain types of boilers having horizontally inclined water tubes, the tubes are arranged in separated banks, in orderto provide a gas passa'ge between the headers of the upper and lowerbanks through which the furnace gases may flowand giving a good location *fora superheater. In this type of boiler, furthermore; it is often convenient to employ inclined headers, this arrangement permitting the water tubes to enter the headers normally. \Vhere such inclined headers are used, the we ght of the water tubes, particularly that of the lower bank, exerts a considerable cross strain and 5 bending moment upon those portions of the headers connecting the banks of water tubes, and it is desirable to provide means to resist this bending and cross strain while, at the same time, permitting access to the superheater for the removal and replacement of tubes therein and the like.

My invention will best be understood by reference to the accompanying drawing, in which Fig. 1 is an elevational view, partly in section, of an illustrative embodiment of myinvention applied to one type of boiler; Fig.2 is a fragmentary view of Fig. 1 as seen from the left.

In this illustrative embodiment, the horizontally inclined water tubes are divided into an upper bank 10 and a lower bank 11, as shown, the two being spaced to form a superheaterchamber in which is a superheater having tubes 12 which are connected to headers 13 and 14. A baffle 15 extends across the superheatcr chamber and across the upper bank of water tubes, so that the furnace gases pass across the lower bank of tubes, then over the superheater surface and then over one end of the upper bank, turning over the top of bafile 15 to pass downwards across the other end of the upper bank of tubes, and out between the headers of the upper and lower banks of tubes to the gas outlct.- 4

In the illustrative embodiment, the banks of Water tubes 10 and 11 are connected to headers nippled together, the headers being inclined and at right-angles to the water tubes, the upper ends of the headers being connected, as usual in this type of boiler, to a steam and water drum, not shown. It will be noted that, in a boiler of this type,

gravity tends to swing the tubes and headers to the right of Fig. l and this must be resisted by the headers and their connections. \Vhere the headers are connected by long nipples, the nipples may not have suflicient resistance to cross strain and bending.

In the illustrative embodiment, I have provided nipples to give sufiicient spaces through which the superheater tubes may be removed and at the same time, I have provided sufficient resistance to thecross strain and bending to which these nipples will be subjected, by extending some of the headers so that their connecting-nipples will be short.

In the illustrative embodiment, long nipples are used for connecting the upper and lower parts of the down-take headers, since there is a gas outlet at the downtake end. The headers-16, 17 are connected by long nipples 18 only.

At the uptake; end of the illustrative embodiment, the headers 19 and 20 are of normal length; that is, are only as long as the height of the respective banks. These normal length headers are connected by long nipples 21 and, since these nipples are smaller in diameter than the width of the headers, there will be spaces between the nipples.

The stiffening against bending is obtained in the illustrative embodiment by extending every third header 20 of the lower bank until it nearly reaches the corresponding header 19 of the upper bank. A short nipple 21 connects the long header to its upper header.

If desired, the spaces between nipples 21 may be closed by removable plates 22 held to the nipples by U-fastenings 23.

The long headers 20 give added resistance to bending and yet, by reason of the presence of the long nipples 21, access to the space between the banks for removing the superheater tubes is provided. Any one of the superheater tubes 12 may be withdrawn and replaced, the space between a pair of the nipples being sufficient for this purpose. If a superheater tube does not come opposite such a space, then it will be swung sidewise until it'does. The maximum amount of such sidewise motion required in the illustrative embodiment will be about one and one-half times the width of a header.

It willbe obvious that the embodiment of my'invention may be Widely varied. For instance, while I have shown the headers 20 connected to the upper headers bythe nipples.2l, it is obvious that the nipple would not be required if these two headers were formed as one piece.

I claim:

1. A superheater boiler having horizontally inclined water tubes arranged in separated upper and lower banks, a superheater between the banks with tubes extending lengthwise of the, water tubes, headers connecting the ends of the water tubes in each bank and extending at right-angles to the zontally inclined water tubes arranged in separated upper and lower banks, a superheater between the banks with tubes extending lengthwise of the water tubes, headers connecting the ends of the water tubes in each bank and extending at right-angles to the water tubes, and connections between the uptake headers and other connections between the downtake headers of the two banks, every-third header at one end of the banks extending substantially across the space between the banks and the remaining connections at said end being formed. of long nipples. A

3. A superheater boiler having horizontally inclined water tubes arranged in separated upper and lower banks, a superheater between the banks with tubes extending lengthwise of the water tubes and headers connecting the ends of the water tubes in each bankand extending at right-angles to the water tubes, pairs of adjacent headers at one end ofthe banks being connected by long nipples and the headers between. said pairs being substantially continuous across the space between said banks.

4. A superheater boiler having horizontally inclined water tubes arranged in separated upper and lower banks, a superheater between the banks with tubes extending lengthwise of the water tubes, headers connecting the ends of the water tubes in each bank and extending at right-angles to the water tubes, and connections between the uptake headers and other connections between the downtake headers of the two banks, the connections at one end of the banks being formed by long nipples to provide a gas pas sage between the headers, bafliing to direct Y the gases back and forth across the water tubes'to the gas outlet, and the connections K at the other end being formed partly of long nipplesand partly of headers disposed between certain or said ni ples and extendthe banks whereby spaces are provided through which the superheater tubes may be withdrawn. j i

5. A superheate'r boiler having horizontally inclined water tubes arranged in separated upper and lower banks, a superheater between the banks with tubes extending lengthwise of the water tubes, headers connecting the ends of the water tubes in each bank and extending at right-angles to the water tubes, and connections between theuptake headers and other connections between the' downtake headers of the two banks, the connections at one end of the banks being formed by long nipples to provide a gas passage between the headers,

bafiling to direct the gases back and forth across the water tubes 'to the gas outlet, and

the connections at the other end being formed partly of a plurality of pairs of adjacent long nipples and partly of headers disposed between said pairs and extending substantially across the space between the banks whereby spaces are provided through which the superheater tubes may be withdrawn. I

6. A superheater boiler having water tubes. arranged in separated banks, a'super- 9 heater between the banks with tubes extending lengthwise of the water tubes, headers connecting the ends of the tubes in each bank, some of the headers at one end of-the banks being spaced apart and connected by long nipples, and the others being disposed between said spaced headers and being substantially continuous across the space between the banks.

7. A superheater boiler. having water tubes arranged in separated banks, a superheater between the banks with tubes extending lengthwise of the water tubes, headers connecting the ends of the tubes in each bank, pairs of adjacent headers at one end of the banks being connected by long nipples, and the headers between said pairs being substantially continuous across the space between said banks.

8. A. superheater boiler having water tubes arranged in separated banks, a superheater between the banks with tubes extending lengthwise of the water tubes, headers connectingthe ends of the tubes in each bank, and connections between the headers. at one end of the banks, said connections being inclined to the vertical and some of them consisting of long nip les and others being interposed between t e nipples and .eonsisting of headers extending substantially across the space between the banks.

WM. s. MONROE.

: ingsubstantially across tie space between 

